255721384251 has 12 divisors (see below), whose sum is σ = 371821529040. Its totient is φ = 169351909200.

The previous prime is 255721384223. The next prime is 255721384279. The reversal of 255721384251 is 152483127552.

255721384251 is a `hidden beast` number, since 2 + 5 + 5 + 7 + 213 + 8 + 425 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (255721384223) and next prime (255721384279).

It is not a de Polignac number, because 255721384251 - 2¹³ = 255721376059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255721384197 and 255721384206.

It is not an unprimeable number, because it can be changed into a prime (255721384211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94083036 + ... + 94085753.

It is an arithmetic number, because the mean of its divisors is an integer number (30985127420).

Almost surely, 2^255721384251 is an apocalyptic number.

255721384251 is a deficient number, since it is larger than the sum of its proper divisors (116100144789).

255721384251 is a wasteful number, since it uses less digits than its factorization.

255721384251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188168946 (or 188168943 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The spelling of 255721384251 in words is "two hundred fifty-five billion, seven hundred twenty-one million, three hundred eighty-four thousand, two hundred fifty-one".